What happens when two different metals are connected in a cell?

When two different metals are connected in a cell, a voltage is produced due to the difference in their electrical potentials. This difference arises because each metal has a unique ability to lose electrons, which creates a flow of electrons from one metal to the other when they are connected in a circuit. This flow of electrons is what constitutes an electric current.

The metal that has a higher tendency to lose electrons (usually the more reactive metal) acts as the anode, where oxidation occurs, while the other serves as the cathode, where reduction happens. The voltage produced is a measure of the potential difference between the two metals. Therefore, the key phenomenon is the production of voltage that drives the current flow in the circuit.

In this context, it’s important to note that while a current does flow, it's the voltage difference that is the fundamental aspect of a galvanic or electrochemical cell formed by the two different metals. This explains why the production of voltage is the correct answer involving the interaction of the metals.